update annotation layout

static/js/annotationPanel.js

@@ -3,9 +3,19 @@
 oml.ui.annotationPanel = function() {
 
     var ui = oml.user.ui,
-        that = Ox.Element().css({
-            overflowY: 'auto',
-        });
+        that = Ox.SplitPanel({
+            elements: [
+                {
+                    element: Ox.Bar({size: 16}),
+                    size: 16
+                },
+                {
+                    element: oml.$ui.annotationFolder = oml.ui.annotationFolder()
+                }
+            ],
+            orientation: 'vertical'
+        })
 
     return that;
+
 };